Chapter 9 Application of Forces and Transfer of Energy

The diagram shows a curved track. A ball is released at point A. At which point does the ball have the maximum gravitational potential energy?

The diagram shows a student attempting to measure the weight of a box. (a) (i) Name the instrument shown in the diagram to measure the weight of the box.

Explain why a girl wearing high-heeled shoes bore deeper marks on a carpet than when she wears track shoes; High-heeled shoes have lesser ............................ .................. than track shoes acting on the carpet.. The girl wearing high-heeled shoes, exerts a .......................... pressure on carpet causing deeper marks.

matchsticks lit up as they rub against the rough sides of the box. As the head of the matchstick rubs against the rough sides of the box, …………………… between the two surfaces generates ………………, causing the matchstick to lit up.

State the energy changes that take place when the following are used. [2] (a) beating a drum: ……………………… energy → ……………………… energy (b) a candle burns: ……………………… energy → ……………… energy + ……………… energy

Match the following energy sources to their correct meanings. [3] Energy Sources Meanings Solar Energy • Heat energy from the hot rocks in the Earth's crust Fossil Fuels • Water in high areas released from dams gains kinetic energy to drive generators to produce electrical energy Hydroelectric Energy • Energy from the Sun Wind Energy • Substances that convert their stored energy to heat energy when burnt Geothermal energy • Energy carried by moving air

Vera is sitting on a swing, oscillating freely between points X, Y and Z. Points X and Z are both the highest points above the ground. State the points at which Vera has the maximum gravitational potential energy.

State the energy conversions from points Y to Z.

The picture below shows a skier sliding down a slope of snow. Define conservation of energy.

Describe the changes in both kinetic energy and gravitational potential energy as the skier moves downhill and reaches the bottom.